#[allow(dead_code)]
struct Person {
    name: String,
    age: u8,
    sex: str,
}

trait Man {
    fn have_penis() -> bool;
}

impl Man for Person {
    fn have_penis() -> bool {
        return true;
    }
}

fn main() {
    let have_penis = Person::have_penis();
    println!("man have_penis:{}", have_penis);
}
